Hooked clamp



Feb. 28, 193

J. LACKNER HOOKED CLAMP 2 Shets-Sheet 1 FiledSept. 28, 1929 R IL alCkher I NVEN TOR.

ATTORNEY;

Feb. 28, 1933.

R. J. LACKNERB- HOOKED CLAMP 2 Sheets-Sheet 2 Filed Sept. 28. 1929 INVENTOR.

ATTORNEY.

' Patented Feb... 28, 1933 nom n'e. LAcxNEn, or OZONE mmmmzw You" c nooxnn Application med September as, 1929. Serial. in. $95,921.

This invention relat'es to's'winging "scat folds and has for its object the provision of means whereby the safety ofthe workmen we will be promoted. The inventionprovides 4i novel constructions whereby the guard cable Figure 1 is a p p e View ofa'siwing'y ingv scaffold infits position ,of use and: 20, equipped with my improved safety 'devices,

Fig. 2 is an elevationbf the anchoring elements, f p Fig. 3 is an penlarged jdetail perspective view of a corner brace and guide which is 26' enejployed in connection with the anchoring cale, I Fig. .l'lSfiIl enlarged perspective view of acable clamp, 4 v t Fig. 5' is a plan view of a snap hook and cable guide, -j I Fig. 6 is a similar view with the upper clamp plate removed, f H Fig. 7 is a detail section on the line17 7 ofF-ig. 5, and i 8 is a long1tudinalsection on the line Q 8of Fig-5; e

Referring particularly to the drawings,

the numeral 1 indicates the anchoring roof "irons which are of the usualfforrn and rest upon Wear plates or boards 2 disposed upon the cornice of a buildin and projecting beyond the same so thatt escafi'old-su port. ing cable's will beheld out of contact-w th the front'ofyth'e building. The innerends' of 4 these roof irons are each formed into time e 3,111 which is engaged end ofthe anchorin is passed aroundac part of the building,

cable 5.' The cable 25 imney 6 01'. other fixed a snaphook l on t uchvasa sk light, and *5' the innerend thereof is connected with the main length o'f the cable by a clamp device 7 which is shown more in detail in Fig. 4. .At each corner of the chimney 6, 1 provide a wear and guide bracket 8, the body ofiwhich i has aright angular seat or notch 9 one side whereby it is adapted'to fit. against the corner of the chimney, skylight or other fixed j element and upon the outer side it is formed with horizontal ribs "10 defining grooves in which the cable'may rest, and at the apexes of the upper ribs islinserted a vertically, disposed; retaining b'oltfll which is adapted to bridgethe portion ofthe cable seatedibe' tween said ribs and thereby retainth'e cable in place. It will be understood that when several. turns of the cable are mad around 1 the chimney at least one turn will'be disposed in the upper groove, and the bolt 10 serves to retain said runso that it will. not interfere v with any of the other runs and will not slip away from the guide, bracket. These brack ets support the cable out of contact with the chimney and thereby, avoid wearru on' the cable and also upon thechimney. a he anchoring cable clamp 7 consists of a head meniber 12 having an overhanging flange 13 along its, upper edge on one face, said flange having depending lugs orkeepers 1 1 at its ends whereby the head is adapted to extend over the cable and rest thereon. Pivoted upon the.

'de'pendingportion of the head below the overhanging flange is a' trigger orxlever 15 which depends below the head and has an opening 16 through its lower extremityin which the end of the cable maybe secured preferably bythe provision ofa snap hook, indicated at'l7. -As shown in Figs. 2'and 4, the upper end of the trig er 15 is disposed immediately below the mile and its upper edge is formed on a-concave are, as indicated at 18, whereby the ends or. corners 19 will acquire the functions of cains to bind the cable against the under side of the overhang ing flange 13 whenever the trigger is swung to one side, as will beunder'stood upon refer- .ence to Fig. 2. Aslon'gas the trigger is per:

pendicular or at a right angleto the flange,- the cable may slide freely betweenthefiange; and the end of the trigger and the clamp may, consequently, be shi ted along the cable flange and, consequently, will be firmly secured. It will be understood that in hanging the scaffold the anchor cable will be drawn taut so that the trigger will be maintained constantly in the clamping position shown in Fig. 2 and, consequently, the cable will firmly retain the roof irons in their set positions.

Suspended from the front ends of the roof irons in any approved or the usual manner are pulley blocks 21 through which are trained the suspending cables'22 The lower portions of these cables are trained through pulley blocks 23 in theusual manner and said pulley blocks are equipped with hooks 24 engaged in'the usual eyes at the upper ends'of the scaffold irons 25, the scafiold platform 26 being passed through and supported by these irons in a well known manner. The irons are formed with the guard arms 25 which rise'from the irons and are provided with loops 27 at their upper ends, a guard cable 28 being passed through these loops and connected with the lower pulley blocks 23 in the manner fully disclosed in Letters Patent, No. 1,568,285,

i issue-d Januaryo, 1926. In the present instance, the guard cable 28 is providedwith snap hooks 29.to be engaged inthe eyes on the under sides of the pulley blocks 23, these snap hooks providing a more secure hold and being more easily manipulated than merely tying the cable into the eyes or rings. The snap hooks 29 areshown in detail in Figs. 5 .to8 and comprise a hook member bridgedbya spring-pressed lever 30 in the usual manner. The shank or bodyof the hook comprises a lower plate 31 integral with the V hook and having longitudinal grooves 32 formed in its upper surface adja cent its side edges. These grooves are preferably V-shaped, as shown in Fig. 7, and at their inner ends they merge into a recess 33 formed :in the upper surface of the plate adjacent the base of the hook element, the outer ends of the grooves opening through the end edge of the plate. There is also an upper clamping plate 34 which. is formed with'longitudinal grooves 35 in its under surface to, mate with the grooves 32 in the lower plate and the grooves 35, like the grooves 32, merge into a circular recess 36 in the under side of the upper clamping plate. A grooved roller 37 is mounted in the registering recesses 33 and 36 and is fitted upon a bolt 38 equipped with a nut 39 whereby when the nut is turned home the roller will be maintained within the mating recesses and the plates will be secured together. A second bolt 40 is inserted through openings rovided therefor adjacent the outer ends 0 the plates and this bolt is equipped with a wing nut 41 to be turned home against the upper clamping plate so that the two plates may be very firmly secured together. The guard cable 28 has its end portions seated. in the grooves 32, 35 so that when the securing nuts are turned home the cable will be very securely clamped and slipping of the same cannot occur. By merely loosening the securing nuts, the'cable may be-shifted through the clamp and thereby adjusted so that it will be accommodated to the length of the scafi'old and a single cable may thus be used at times upon many dilferent scafi'olds.

It will be noted that the base of'the hook is expanded laterally to the width of the clamping plate and merges into the end of the plate so that the strain will be applied along the medial line of the device All parts of the ulley and the bight of the cable are completely housed by the clamping plates so that these parts will not be exposed in any portion and, consequently, cannot be displaced or bent or 1 otherwise damaged by blows from falling objects.

The workmen are fitted with belts 42 to which is firmly attached a short cable 43 sufiiciently long to permit the workmen to move freely as their labors demand and at the outer ends of these cables are snap hooks 44 engaged in triggers'45th'e same in all re- 'spects as the trigger 15 shown in Figs. 2 and 4 and previously fully described. The triggers 45 are mounted upon and cooperate with heads 46 which are of the same construction as the heads 12 and operate in the same manner.

The headsf46 are engaged over the cable 28 so that as long as the trigger hangs perpendicularly the heads may move freely along the cables in the manner of a trolleyl Should the suspending cables 22 break so that the scafi'old would be tilted or drop at one end, the cables 43 would be immediately subjected to a pullwhich would cause the cable 28 to be clamped by the triggers 45 and heads 46 and the workmen would, consequently, be suspended on the guard cable and held thereby until theycould berescued.

The scafi'old would not be entirely freed in the event of a breakage in the suspending cables inasmuch a'sit is equipped at its ends with the safety clamping devices 46 which are fully shown and described in Letters Patent, No. 1,488,822, issued April 1, 1924. 7

Having thus described the invention, I claim: i i I p A device for the-purposesset forth comprising clamp plates provided in their opposed faces with longitudinal mating grooves and with recesses at the inner ends of the rooves said rooves bein -V-sha ed in cross section and the recesses being of lessdiameter than the width of the plates, a pulley mounted in the mating recesses andaboutwhich the v bight of acable is trained with the sides of the bight engaged in the grooves, a hook having its base expanded laterally to the width of the clamping plates and merging into the recessed end of one ofsaid plates for engaging a scaffold-suspending device, a boltinserted through the recessed ends of the plates to secure them together andconstitute an axle for'the pulley, and a bolt inserted through the opposite ends of the plates between the grooves whereby the plates and the bight of the cable will be firmlysclamped together. g

In testimony whereof I aflix my si nature.

ROLPH J LACKNE-RQ' FL. 5.] 

